CVE-2025-8034: 
NixOS vulnerability analysis and mitigation

CVE-2025-8034 is a high-severity memory safety vulnerability affecting multiple Mozilla products, including Firefox ESR (versions 115.25, 128.12, 140.0), Firefox 140, Thunderbird ESR (versions 128.12, 140.0), and Thunderbird 140. The vulnerability was discovered by the Mozilla Fuzzing Team and disclosed on July 22, 2025 (Mozilla Advisory).

The vulnerability stems from memory safety bugs that show evidence of memory corruption. The issue has been assigned a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating a serious security risk. The vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) (NVD).

The memory corruption issues could potentially be exploited to run arbitrary code on affected systems. Mozilla security researchers have indicated that with sufficient effort, these memory safety bugs could be weaponized for malicious purposes (Mozilla Advisory).

Mozilla has released fixes in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird ESR 128.13, and Thunderbird ESR 140.1. Users are strongly advised to update to these versions to mitigate the vulnerability (GBHackers).